7596-2

Variable Capacitance Accelerometer Model 7596A • • • • • Economical and Rugged 2 to 100 g Full Scale DC Response Gas Damped Sensor Mechanical Over-range Stops Actual size ENDEVCO MODEL 7596A DESCRIPTION The ENDEVCO® Model 7596A VALULINE™ accelerometer family is a low cost solution to low-level, low frequency measurements. Applications include laboratory measurements, ground transportation studies and measurements where the accelerometer will be subjected to high shock levels (up to 10 000 gs, see specifications). The 7596A is ideal for modal studies on large structures. Gas damping and internal overange stops enable the anisotropically etched silicon microsensors to withstand high shocks and acceleration loads. The use of gas damping, in the sensor, results in very small-induced changes of frequency response. The patented sensor design ensures immediate stability making the unit ready to take accurate DC or dynamic data within one millisecond! The 7596A can operate from 8.5Vdc to 30Vdc and provide a high level, low impedance output. The output is high enough to drive most laboratory instruments, tape recorders and data acquisition systems without amplification or signal conditioning. The output can be fed into either a differential or single-ended amplifier or standard bridge electronics with 10Vdc excitation. ENDEVCO Model 136 Three-Channel System, Model 4430A or OASIS Computer-Controlled System are recommended signal conditioners. SPECIFICATIONS PERFORMANCE CHARACTERISTICS: All values are typical at +75°F (+24°C) and 15 Vdc excitation unless otherwise stated. Calibration data, traceable to the National Institute of Standards, (NIST), is supplied. Units g pk mV/g Hz Hz % FSO Typ % FSO (Max) % Typ mV Max %/°F %/°C 7596-2 ±2 1000 ±100 0 to 15 1300 ±0.20 ±0.50 1 ±200 3.0 +0.04 +0.08 -10 ±10 200 ±20 0 to 500 3000 ±0.20 ±0.50 1 ±200 0.7 +0.04 +0.08 -30 ±30 66 ±8 0 to 800 5500 ±0.20 ±0.50 1 ±200 0.7 +0.04 +0.08 -50 ±50 40 ±4 0 to 1000 5500 ±0.2 ±0.5 1 ±200 0.6 +0.04 +0.08 -100 ±100 20 ±2 0 to 1000 6000 ±1 ±2 1 ±200 0.6 +0.04 +0.08 RANGE SENSITIVITY (at 100 Hz) [1] [2] FREQUENCY RESPONSE (± 5%) MOUNTED RESONANCE FREQUENCY NON-LINEARITY AND HYSTERESIS [3] TRANSVERSE SENSITIVITY [4] ZERO MEASURAND OUTPUT [2] DAMPING RATIO DAMPING RATIO CHANGE From -65°F to +250°F ( -55°C to +121°C) APPLIES TO CALIFORNIA FACILITY ENDEVCO Variable Capacitance Accelerometer SPECIFICATIONS—continued PERFORMANCE CHARACTERISTICS—continued Units 7596-2 -10 THERMAL ZERO SHIFT From 32°F to 122°F (0°C to 50°C) % FSO Max ±2.0 ±2.0 From -13°F to +167°F (-25°C to +75°C) % FSO Max ±4.0 ±4.0 From -65°F to +250°F (-54°C to +121°C) % FSO Max ±6.0 ±6.0 THERMAL SENSITIVITY SHIFT From 32°F to 122°F (0°C to +50°C) % Max ±2.0 ±2.0 From -13°F to +167°F (-25°C to +75°C) % Max ±4.0 ±4.0 From -65°F to +250°F (-54°C to +121°C) % Max ±6.0 ±6.0 THERMAL TRANSIENT ERROR Equiv. g/°F < 0.0006 < 0.0006 PER ISA RP 37.2 Equiv. g/°C < 0.001 < 0.001 OVERRANGE (Determined by Electrical clipping or Mechanical stops, whichever is smaller.) Electrical clipping g -3.5/+3.8 -18/+19 Mechanical stops, typical g ±4 ±30 Recovery Time µs < 10 < 10 THRESHOLD (RESOLUTION) [5] Equiv. g’s 0.0005 0.0025 BASE STRAIN SENSITIVITY, MAX [6] Equiv. g’s 0.01 0.01 MAGNETIC SUSCEPTIBILITY [7] Equiv. g’s